From Gineipaedia, the Legend of Galactic Heroes wiki

Pretzer (Japanese: プレツェリ) was a Fezzani diplomat who served as the dominion's high commissioner posted on Heinessen. The merchant ship captain Boris Konev served as his secretary for some time. He was seen packing up documents at the High Commission after Fezzan was occupied by the Galactic Empire, but what happened to him afterwards is unknown.